We loved staying at Alex's place. It was clean, spacious (more space than needed for our 5-people group!) and complete with necessary amenities. We also loved its location, being central at Sukhumvit with just one minute's walk to a convenient store.
The only thing to note is that the there are also a lot of stairs in the house, and we had trouble taking our heavy luggages up. So we left them on the ground floor and only took what's necessary into our rooms.
Overall, it was a pleasant stay and we would love to come back if being given the chance. Thanks, Alex!